Operating systems

The STX ExecPipe library provides a convenient C++ interface to execute child programs connected via pipes. It is a front-end to the system calls fork(), pipe(), select(), and execv() and hides all the complexity of these low-level functions. It allows a program to build a sequence of connected children programs with the input and output of the pipe sequence redirected to a file, string, or file descriptor. The library also allows custom asynchronous data processing classes to be inserted into the pipe or placed at the source or sink of the sequence.

Image Selector previews images defined in select input options. It can take as a parameter the identifier of a form select input element which has options set to the URLs of images to be picked by the user. The object can display the currently-selected image inside a preview page element. The object can also change the currently-selected image to move to the next, previous, first, last, or to any of the images in the list.

Multiple Select Dropdown List with AJAX can be used to dynamically create multiple Select lists with data from a MySQL table. When the user chooses an option from the Select list, it calls an Ajax function which accesses a PHP file, which will return another Select dropdown according to the option selected.

Select2D.js is an object that transforms an HTML <select> into a 2D table. It can automatically layout the table with a configurable number of columns or rows. Users can select multiple options by using the Ctrl key or Shift and click and dragging over the options in the table. By default the original form select input is hidden but it may be made visible for debugging purposes.